A friend is the one who you can trust and will not leave you alone when you are in need of

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A. mean
(答案→)B. reliable
C. stubborn
D. determined
解析：A. mean吝啬的，B. reliable可靠的，C. stubborn固执的，D. determined有决心的，句意：一个可靠的朋友是你能信任的人当你需要帮助的时候不会把你单独留下。选B。